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Nervous Systems, Function and Survival

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) Nervous systems, function and survival Invertebrates and vertebrates are compiled of many different cells, systems and functioning pathways all of which are maintained by homeostasis. In this essay I will discuss the connection between homeostasis and the nervous system; briefly compare an invertebrates and vertebrates nervous system; nerve cells and how an organism’s behaviour can be determined by these factors.
To survive every living organism endeavours to maintain a sense of balance, or homeostasis. This is an internal process which repairs and sustains different parameters and is constantly challenged by both internal and external factors. An organism’s nervous system, which can control thousands of activities simultaneously (both voluntary and involuntary), transmits signals between the different parts of the body and is responsible for regulating the processes which maintain homeostasis. (Datta et al. 2006 pp.8-10)
In invertebrates the nervous system consists of either a nerve net (such as in jellyfish) or neurons grouped together forming ganglia which make up the nerve cord, or CNS of the organism (as found in earthworms). (Datta et al. 2006 pp.47-9) In contrast the nervous system in vertebrates can be divided into two parts, the brain (the control centre of the body) and the spinal cord, collectively known as the central nervous system (CNS) and all the other nerves in the body, collectively known as the peripheral nervous system (PNS). (Datta et al. 2006 p.13)
There are three main components to a vertebrate’s brain, the forebrain, midbrain and hindbrain, each of which can be divided into separate parts. Many functions, such as the receiving of sensory information and the control of motor functions, occur in the forebrain which consists of the cerebral hemispheres, the hypothalamus and the thalamus. (Datta et al. 2006 p.107)

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